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Re: Operate on region string
From: |
Hadron Quark |
Subject: |
Re: Operate on region string |
Date: |
Mon, 18 Sep 2006 14:21:08 +0200 |
User-agent: |
Gnus/5.110004 (No Gnus v0.4) Emacs/22.0.50 (gnu/linux) |
Pascal Bourguignon <pjb@informatimago.com> writes:
> Hadron Quark <hadronquark@gmail.com> writes:
>
>> Whats the "de-facto" recommended way to work on a region?
>>
>> I guess the sequence is something like
>>
>> (setq t (region-text))
>> (setq t (dowork-on-text((t))))
>> (replace-region(t))
>>
>> What is the correct approach?
>
> 1- DO NOT ASSIGN to CONSTANTS!
I should have but "text"...
>
> 2- Know your constants: NIL, T, the keywords [starting with ':'],
> and anything else declared with defconst.
it was just pseudo code : but I take your point.
>
> 3- Know your programming language and your library functions. There
> is no function named t [so you cannot call it with (t)], and in
typo : see above.
> emacs lisp, which is a lisp-2, contrarily to scheme which is a
> lisp-1, it's meaning less for the operator in a form to be anything
> else than a symbol or a lambda expression [therefore, no ((f))].
>
> 4- There is no region-text function in emacs. You can use
> buffer-substring or buffer-substring-no-properties.
It really wasnt code : see above ... :-;
>
> 5- There is no function replace-region in emacs. You can use
> delete-region and insert.
>
> But if you want the best performances, emacs is optimized to work in
> the buffers, not on strings. So if you can do it, better to directly
> modify the buffer:
>
> (defun my-command (start end)
> (interactive "r")
> (do-work-on-region start end))
this is what I wanted to know : what is the best way to "do-work-on-region"?
--
- Operate on region string, Hadron Quark, 2006/09/18
- Re: Operate on region string, Pascal Bourguignon, 2006/09/18
- Re: Operate on region string,
Hadron Quark <=
- Re: Operate on region string, Tassilo Horn, 2006/09/18
- Re: Operate on region string, Tassilo Horn, 2006/09/18
- Re: Operate on region string, Hadron Quark, 2006/09/18
- Re: Operate on region string, robert . thorpe, 2006/09/20